I was hoping that some of you would do me a favor and look over this schematic and double check my work. I think I am close to figuring this out, but I wanted to be sure I was not about to short something or create an undesired side effect or parasitic drain. I have been pouring over this site and the schematics in the shop manual for a few days.
The vehicle is a 2002 VW Jetta Wagon. The goal is to add Perimeter Lighting / Illuminated Entry to the factory alarm, using the Dome Light (+) as a Trigger. However, the Ignition would interrupt this signal, so if the dome light was triggered from a door being opened while the car was on, there would be no change to the exterior lights.
The reason I would like to use relays, and the dome light trigger is because I would like the lights to mirror each other. If I used a device like the PAC-TR7 or the DEI 528T, there would be an additional timer for the lights that would not be synchronized with the factory alarm, specifically when the alarm Times Out and Re-Arms – for instance, if the alarm times out, and the car locks, 60 seconds after the Un-Lock signal from the Fob – I would like the exterior lights to turn off at that time. If the alarm is re-armed via the Fob – I would like the exterior lights to turn off at that time. If the door/hatch is opened, regardless of the Fob activity – I would like the exterior lights on, just like the interior dome light would be.
I am choosing to switch the Left & Right Low Beam in Front and the Reverse Lights in the Rear. The headlights are pretty much self explanatory. I am choosing the reverse lights instead of the parking/running lights primarily because the audible chime used to remind you that your lights are on when you open the door is tied to the parking light circuit. There is probably a way around this, but it would involve some rewiring at the instrument cluster, and additional Diods & Relays, I think. At any rate – the reverse lights are brighter and the circuit less complicated.
Some of these connections can/will be made at the fuse panel instead of the location listed, but oddly enough the schematics don’t really call out terminal pin locations at the fuse panel, just the fuse number itself. Also my Electrical Engineer Father (apple fell FAR from that tree) pointed out my Relays should be labeled “K1”, “K2” & “K3” –not- “A”, “B” & “C” and I also need to add a Rev Level, Key, Date and Signature – LOL.
Relay A (or K1) takes the Dome Light signal (30) and passes it onto the other relays while ignition is off (87a). When the ignition signal is added, the dome light signal is broken. Relay B (K2), if there is no Dome Light Signal (85) then the connection from the Light Switch (87a) to the Low Beam Bulb Fuse (30) is closed and the switch will work as normal. If there is a Dome Light signal (85), then the Constant Power (87) (Bypass the Headlight Switch) to the Low Beam Bulb Fuse (30) is closed. Relay C (K3), if there is no Dome Light Signal (85) then the connection from the Reverse Switch (87a) to the Reverse Bulbs (30) is closed and the switch will work as normal. If there is a Dome Light signal (85), then the Fused Reverse Power (87) (Bypass the Reverse Switch) to the Reverse Bulb is closed (30).
So… anyone have any input before I let the Magic Smoke out? :D Thanks for your help!!!
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-Pete